I dont know any skin people to suggest but there are various places out there that sell skins like vbstyles.com
As far as Photopost it will work with much any skin now if you have custom graphics in the skin in custom directories the most you need to do usually is edit the style properties of the skin and make the relative paths like this
style/images/misc
to say this
http://www.domain.com/forums/styles/images/misc
Basically make your relative paths full urls. It is quite simple really.