That's not all you can get out of a personal base... But I stayed that size for quite a while. Instead of slowly upgrading, I waited till I had enough prestige to make some major improvements before editing.
In the last month, I went to 2x3 and 3x3 power and control (I think those are the room sizes). From 4 teleporters to 8 teleporters in the 5x5 room. Added 2 more enhancement tables for lower level IO's for alts, and another inspiration bin. Had to upgrade to the 12x12 plot, but that was also part of the plan.
One good thing about it being personal, is I can design it how I want it. My kids play, but just like me, while the base serves more of a transport and storage function, the biggest thing for all of us, is the cool factor. Slowly but surely, it's becomming a huge maze with hidden rooms etc...
Still from a functionality stand point, I've made it fairly straight forward getting to the neccessities like teleporters, the control room and the crafting room.
But some things you could add in the short term....
Personal Vault - It really is a convenience sometimes, but easy to live without.
Empowerment stations - Recharge and recovery buffs, while minimal really do help out for alts pre-stamina, and the smashing/Lethal resistance, who wouldn't want that on a lowly fledgling blaster? They are under-hyped mostly because everyone has level 50's and even more so now that 1-20 can be reached in an afternoon, but I still level my Alt's the old fashioned way doing contact missions and the buffs I think were meant for lower levels. I keep 4 Salvage bins stocked with the right salvage for the buffs I like to use. There's even status protection for those scrappers without it and the buffs last for an hour, great for soloing.
Go for the healing badges to get the inspiration dispensers.
Are you looking for functionality ideas or decorative ideas?
For functionality, I find that even the low level empowerment station is handy. I like being able to stop by the base between mishes in a tf and whip up a little extra stealth or defense (temp powers last an hour, not the 15 min. stated in their text). 
Do the 2 tp'rs work for ya? Maybe expand on that a bit. It's nice not to have to be constantly switching out beacons just to travel where you want when you're in a hurry. Even though I have the mish porter power, Oro portal, and Pocket D, I've found my expanded tp room to be a blessing in certain situations.
I'm a little confused by what you mean by "inventions table", is it one of the base crafting tables? Some folks tend to pull those out on an "as needed" basis, then just delete them when done. They tend to tax the power/control a bit.
For decorative, well, there are a ton of ideas throughout this forum. Some popular rooms include library/study, bar, apartment, park, pool room, secret rooms...etc.,. 
Quote:
|
Don�t say things. What you are stands over you the while, and thunders so that I cannot hear what you say to the contrary. - R.W. Emerson |
YUMMY Low-Hanging Fruit for BASE LUV
I forgot, I already have the Supercollider, and put it to use.
And I have both a base crafting table and inventions table.
The Paragon City branch of Cybertech Laboratories has just 7 heroes to its name, and recently went under major renovations to make it more cost-effective, and because I finally clued up about how bases work. Having my own SG base really seems like the best idea with my incredibly erratic play hours and love of creativity.
Currently I have what I consider the basics and then some- two teleporters, an Inventions table, salvage and enhancement storage, a reclaimator, basic control and power facilities to run it all, and my most recent additions are a Holodisplay and Pillar of Ice and Flame.
I manage to raise a good deal of prestige through membership bonuses (though I don't like to pad them), occasional farming (I'm currently building a dedicated farm toon) and generally playing in SG mode all the time on every alt, I figure these days drops will make most of my inf.
Anyway, I'm currently considering that I've basically gotten all of the things I really want from a personal base, and wondering- what should I do next? I've been doing some furnishing since the place is mostly bare, but I rarely get guests. I currently have much more power than I need, plenty of slots left over for storage bins, and room for (I think) three more 4x4 rooms in the default base size. (I used to have the bigger one but downsized it to save space and money)
The theme of the base, as you might have guessed, is a science and tech research lab, and the Tech options in general fit the theme nicely. I figure the place being a bit cluttered would really only add to the theme, and I don't mind turning the base into a platforming challenge.