I've advanced rather far in programming an isometric tile-based game in Java. However, I'm really a programmer, not a painter or designer. Creating even the most basic mock-ups of sprites and buttons takes ages for me. Does someone know a place where isometric graphics (sprites, tiles, ...) can be downloaded?
I know you've heard this before, but try searching on google, with "sprites", "isometric" "ripped". You might find something useful, and as long as you're not selling the game, it should be fine.