Simple and straight forward!
I like how simple it is to make great looking collages in a very short period of time… One thing I would do is allow the user to select custom aspect ratios as not everything is 16:9, 4:3 or 1:1… also allowing the user to select a higher output resolution would also be helpful for larger displays!
Sirtuc about
PicFrame - Collage Layout, v2.6