Combine two photos in the Photoshop is very easy with the help of eraser tool. Below are steps which will help to combine two photos :
you upload them
Photobucket
To overlap two photos, you can use photo editing software like Photoshop or GIMP. Simply open both photos in the software, place one image on top of the other, adjust the size and position to create the desired overlap effect, and then save the final image.
Try Photobucket.
photobucket and google. photobucket is better though
Try PHOTOBUCKET
twilight myspace ummm...google photobucket
You can upload pictures at Photobucket. http://photobucket.com
They are just different sites where you can view photos.
Two good examples are Photobucket and Imageshack.
I'm not sure about this one, but you can join 2 to 4 pictures on this site: www.picnik.com. (I hope this was of any help) :D
Ya, photobucket will allow you to do so; I think.