I love to browse TattingChic's list of patterns she's gonna tat. That is where I first saw this really pretty square motif. I used TattingChic's link to this pattern. It is by Lady Lace Tatting and you can find the pattern here. Thank you to Lady Lace for the free pattern and TattingChic for showing me to it.
I like square tatting motifs. The pink one is done in Flora 20 #206 and the light green/gold/blue one is done in a metallic DMC (?, I lost the label) thread. It looks a little different from Lady Lace's but perhaps I should try it in a dark thread.