To simplify matters, and to better present your photos in an orderly (hindi masakit sa mata) way --- consider using just 1 frame in 1 size for all your photos on a single wall. The adjustments would just be in the size of the matting utilized. (Look at latest issues of Architectural Digest & our better local interior design magazines... The mantra now is to not look cluttered, but to look put together)
That approach of using a uniform frame makes the photos pop out more. Kahit sangkaterbang photos pa isabit mo... the wall will never look cluttered.
It will also make it easier for you to put together x no. of frames. Just go to SM or Home... and get those frames in one go. Measure mo muna your wall space, that portion you want to fill up with photos, then compute how many frames of a certain size you will need. Get the biggest frame you are comfortable with... then no matter how small or big your photos are, ma accommodate nang frame na yan... sa matting nga lang ang adjustments.
If you wanna go for fancier, old-world elegant frames (which can be used as an effective foil in a modern-themed home) .. go to Gallery Frames at SM Mega. Get their Spanish frames.. I meant,they have these framing materials from Spain they can measure and do up according to your specs. These are pricey but well, really a good investment in the long run.