A cool ceiling lamp with a nice pattern!

Materials needed

(square) wood 'laths'(?)
wood for box frame
LED strip, with or without color
tracing paper or something sturdier
mounting bracket
saw
staple gun (optional)
wood glue
hot glue
white paper/paint

Mistakes made (way too many):

used only wood glue for the small connecting bits at first, a staple was needed
the frame was too shallow, so you'd see all the individual LEDs, so had to re-do
used wrong wood for frame, small bits of wood are a hassle to useused bend wood, so nothing is really straight
used color LEDs (I'm not convinced, I'll use just plain white LEDs next time)
made custom mounting brackets from bendable aluminium, which was way more effort than it was worth (just couldn't come up with a better way at that time)
tracing paper glued on on an angle so it wouldn't cover the whole thing (1st try), ripped tracing paper (2nd try)
burned fingers when squeezing tracing paper on hot glue

Step 1: Create the Cover With Pattern

I bought a bunch of square wooden bits at the local Bauhaus and just started cutting them up. A had no design in mind, this just happend.

Tip: use quick setting wood glue + a staple in the back so you can quickly get this done

Tip2: those corner clampy things didn't help as much as a staple in my case

Step 2: Glue Tracing Paper to Cover

To make the light nice and matte, use something like tracing paper or a matte piece of plastic.

Tip: this was the hardest part of the lamp, so fiddly and breakable. Take your time or choose a better material :)

Step 3: Build a Frame

Build a frame to put the leds in.

The back; I didn't have a big piece of multiplex, so I had to make do with some leftover bits.

The sides; I tried to build a shallow frame, but that didn't turn out well. So better do it right straight away and build a deep enough frame (8cm/3"?) so you don't see the LEDs all the time :)

Step 4: Mount It & Enjoy!

When it's all glued together, use some mounting things of your choice and mount it :)

I went the 'way to complicated' route and made custom brackets with bendable aluminium, drilling holes, screwing into plugs and all. Too much trouble.