The best you can do it make it a "hard on memory usage" coin, like Monero, o
That is the closest to what I mean, but it still fails at the task, GPUS still have a huge advantage
For example, solarcoin is based on production of electricity, not processor cycles.
Thats not decentralised at all
If you're interested, I do have a few ideas...
Yes Ill gladly listen to ideas