You mentioned doing this in Photoshop, which is cool but here's the difference in case you did not know. Photoshop is a bitmap editing application. Xara Designer Pro and related products are vector drawing apps that can also work with bitmaps.

But if your intention is to fish for solutions in this forum and then take them into Photoshop, the two apps do the same thing in very different ways.

Unless you plan of using a vector drawing app (BTW you can download a fully functional 30-day trial version) you might be better off finding a Photoshop users group.