When I went to IKEA earlier this week, no Racket frames were available and they no longer appear on the website. It looks like these are limited to stock-on hand.
The process should take about 10 minutes, it took me about 15 minutes including taking these fantastic pictures. The size depends only upon your imagination and budget.
Step 1: Gather Materials and Tools
12 - screws 5/8"-3/4" or 5/8" brads
1 - drill bit for pilot holes
2 - eyelets
2 - screws for attaching finished frame to wall
Step 2: Arrange Frames face down and hot glue in place
After the frames are arranged the way you want, hot glue at each point the frames overlap. If works best to have the frames overlap in at least two places for the screws you will add next.
Step 3: Drill pilot holes and add screws
Drill the holes where the two smaller frames overlap. When you screw it together, it may be useful to use a manual screwdriver (yes, a Manual screwdriver) so as not to split the frames.