Finally, i found an app that can do this. It's called Image Combiner.
Also, if you Google the phrase 'Combine Multiple Pictures Online'
you will find a number of sites that do tbis, though not all of them
will work with mobile devices.
One that i recommend is Filesmege.com. In addition to combining
pictures, Filesmerge can also combine other types of files like Text, Word,
Pdfs and Mp3s. Also, at Filesmerge you can combine either files from the Web,
your device or a combination of both.