I hear ya' Wavicle, I have an older Stone/Fire Tank that rarely gets any play time. I'm usually runnig my Elect/Fire or one of my many other "Tanks/toons in progress". As for things to do with him, how about Tanking for the Hami riads 
Tanker Tuesdays: Meet in King's Row by IP Gate 6pm PT9pm ET.
1st Tuesday on Champion, 2nd Tuesday on Justice
3rd Tuesdays (Odd months) Freedom, (Even months) Virtue, 4th Tuesday, Tour, Server TBA
Brutal Thrashing Thursdays: Justice (ask Papa Slade when),meet in RWZ 6pm PT9pm ET.
You could try getting your granite beyond its penalties. Use the other toons to fund a faster build, rebuild the granite, do the incarnate stuff and overcome all penalties near as dammit!
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
Why put all that effort and money into a toon that isn't fun to play? I can't get around the -Jump -Fly penalties. -Jump is the main thing that makes him no fun.
Wavicle, Energy/Energy Blaster, dinged 50 in Issue 4, summer of 2005.
@Wavicle, mostly on the Justice server.
My fire melee/stone brute was the first character I used a free transfer on to ship off to my retirement home of Exalted.
She was tough, but not so much tougher than Inv on brute to justify the inability to jump over puddles.
Weight training: Because you'll never hear someone lament "If only I were weaker, I could have saved them."
I reorganized my first page of toons on my home server. The first 12 are all 50 and I put them in order of how much they have been advanced since hitting 50.
At the top is my Storm Defender, with a full Set IO build, including 5 LotGs, various other shinies, and multiple t4 Incarnate powers.
then it runs down the list, getting less and less powerful
until finally
we get to my first level 50 Tanker, Stone Armor/Super Strength. Only SOs, no IOs or Hamis. Not even an Alpha Boost. Since I made my Shield Defense Tanker there has never been ANY reason to play Stone Armor.
It's sad really.
Maybe if they nerfed Granite enough so that they could justify letting you use it with the other armors running and then removed the penalties, then I might have Some reason to EVER play this toon...
But that could never happen could it?
And would people even want it to?
Wavicle, Energy/Energy Blaster, dinged 50 in Issue 4, summer of 2005.
@Wavicle, mostly on the Justice server.