It's Spirelli! Does it remind you of Spirograph? Me too!
There is an error on this card- did you spot it? Honestly, I never noticed it until I was looking at the photo just before posting this. Decided to go with it for now and fix it later. For the 'feel' of this card, it doesn't really change anything.
There are some great tutorials online for this technique- they teach way better than I could describe it, so if you're interested, type 'spirelli' into Google.
Have a great day!
So, did you find it?