There are quite a few Online Creators for RMXP/RMVX already, mostly Japanese sites.
I recently discovered – quite by accident – a French site,
Nine Sages (sadly offline because of lame-ass hackers!), which has some absolutely stunning Title and Game Over pictures, in addition to some fabulous resources. It’s well worth checking out.
The pièce de résistance for me was finding a working character maker for RMXP. It is still limited in the amount of resources for characters, but it does have enough to make some decent character sets.
The generator can be found
here. It is in French, but does not need translating as it’s easy enough to use.