Was wondering if someone would go with this theme interpretation; very pleasant experience, well made!
It was hard to tell which colour I ended up with from the palette, and I sometimes felt like the resulting element didn't match the colour I thought I clicked? It might have been nice if the brush could change to show the selected paint colour. Also, full screen support would have been very nice.
But overall great job, very impressive for the time; hope it was fun to make!