2D Isometric Art Tutorials / Help

2D Isometric Art Tutorials / Help

Anyone know any good isometric art tutorials? I'm not very artistic at all, vector seems simplest, but even with vectors I suck. Just trying to make some placeholder 2D isometric blocks for prototyping games with. This is best I could come up with after playing with inkscape for a few hours lol:

 

 and

 

 

Might be best if I just try to go with solid colors instead of adding details lol.