Photo Frame : Easy Collage v36 APK
Then your choice is 'Easy Photo Merge'.
As you know, there are lots of photo editor apps in the market, but I swear 'Easy Photo Merge' is easiest way to merge photos.
Just use it right away and feel happy.
About 40 layouts
Share to SNS services ( facebook, twitter, instagram and so on )
Save to gallery ;-)
Update:
Add frame ratios to support wide ratio ( 3:2, 4:3, 16:9 )
Change the app name from 'Easy Photo Merge' to 'Easy Photo Frame' ;-)
Screenshots : Let's look!!