The idea of carvable pumpkins makes me want carvable/paintable canvases.
I want to have an art studio full of my own art, painted in game tediously and with anguish
There's an idea - custom art. A simple paint, limited-palette (perhaps you have to find certain things to be able to make certain paint colors?) and limited-size canvas (can combine multiple canvas to make bigger canvas?) that can be edited to be custom paintings. Sort of like the giant pixel art, just small. There would be some absolutely beautiful galleries... alongside the vandalism involving body parts and naughty words.