This looks pretty good, and is worth checking out.
Remember, your cover IS your book.
1) Amateur cover signals amateur, poorly-written book. Hire an experienced cover designer.
2) Generic covers signals "already read it" to potential buyers.
3) Aim for distinctive, not "unusual". The latter means "too far outside readers' experience".
4) No one will or should read anything that's been contaminated with clip art or Comic Sans.
That being said, maybe you have a simple graphic or photo background and Helvetica in mind, and this thing will crank out a "photo" of a stack of your books, even if you never print a single copy. $10 allows you to make 100 covers in one month, so if you have 4 or 5 e-books this could make a lot of sense.
Also works for CDs, credit-card looking membership cards, DVD clamshells, software boxes, 3-ring binders... Clever.
