The Mosaic - Modulare Picture Frames

I wanted to decorate the hallway in our flat with some pictures. But as I continuously take new ones, and I don't want to get out the hammer and nails every time, I designed this modular picture frames. 
With this one you just need to secure one frame, on to which you can than attach more frames. As I did hang up some frames, I secured two to the wall with M3 Screws (the ones marked in red in the second photo). 
This Frame can accept photos that have a dimension of 17 x 13cm. If you want to hang pictures bigger or smaller, you could of course up/downscale in the X/Y Direction according to your needs. 
I also did expand my photo wall quite a bit, you can see that in the second set of pictures.

The pictures are held in place by 6 small tabs, so there's no need for glue or plexiglas. You just bend the picture a little bit to get them under the tabs, and thats it. I found it the easiest, to insert them from one of the smaller sides and then just slightly bend them. 

I designed three different variations:
Frame 17x13 Wallmount - This frame is the one you attach to the wall and acts as a starting point for all other frames.
Frame 17x13 - Basically the same as Wallmount, but without the mounting holes and slightly thicker tabs. All in all it's the same thickness as the wall mounted one.
Frame 17x13 Thin - This one uses the same thiner tabs as the wall mounted one and over all is a little bit thiner then the other ones to conserve filament.