This one doesn't make much sense (since when are micros too big?), but it's cute...
83x58mm when folded, 138mm motor-to-motor (diagonally) when unfolded. So no, its not very micro, I know. And it's one heavy micro, don't expect to do any acro with it. I designed it mostly because I had an idea and I like to draw stuff ;)
The Quanum micro camera/vtx combo from HobbyKing fits perfectly and the camera angle is adjustable between 0 and 30 degrees. The arms have slots for clean wiring and to prevent accidental cutting of motor wires when folding the arms.
I'm running mine with the following hardware:
If you use a Beef's Brushed Board you'll also need an FTDI adapter to communicate with the board
I used the setup above mainly because I already had all the necessary parts at home, there are (most likely) better/cheaper parts out there if you google. There are also a bunch of links in the comments to alternate hardware
Here's a good page to get you started with hardware similar to the one listed above
Added new arms with slits for the motors (as shown in the pictures). Uploaded the wrong version previously, sorry
Added new, thicker arms for you guys who prints in PLA. These should hold up better in a crash. Also, user unclecracker made a remix of the arms to fit 7mm motors: http://www.thingiverse.com/thing:1675767
Here's a nice camera mount for the Eachine TX03 (and probably other AiOs as well) by murrayp0473
Print the arms upside-down. Print two of each arm.
I printed mine in PLA which isn't optimal for the application...
"Left arm" goes front left and rear right.
"Right arm" goes front right and rear left.
Mount the camera plate with two M2 screws (min: 4mm, max: 7mm)
Run a nylon or steel screw (M3) through the entire sandwich and secure with a nut.