Thanks, all4cake -- I take that as a real compliment, coming from a talented cookiemaker like you!!! I just free-handed the squares with glace. That's why they're not uniform.
And, yes, I used tip 1 to make the ants. I found that, if I piped the whole body at once, it just ran together. So, I did the front and back dots, let them set for a few minutes, then went back and piped the middle ones.
The cookie was still fairly wet when I took the photo, but it's almost dry now and it's still somewhat shiny.