Are WordPress themes interchangeable with Tumblr themes?

i just made an account on tumblr, never used a site like that before and well, making a theme on it is turning out to be harder than ive expected.

ive worked with CSS before, but this is completely different than anything ive ever done… design is my strong point, not coding.

after a bit of googling, the closest thing to a theme generator for tumblr i could find was this:

its a theme generator for wordpress, but there are indications that it might work for tumblr too, but its not clear. can anyone tell me for sure if this works or not? or recommend one that DOES work for tumblr?

id like to know for sure before i go through the trouble of making all the graphics then having them not work.