The "Celtic knot book mark" by Mememastermax is ideal for remixing to add characters to the top. Never read a book again without having a bookmark specifically designed for that book!
My grandaughter loves the beautiful unicorn design by fragar - which she has also declared that I will remix to replace all of the light switches in the house (see the wonderful duplex switch https://www.thingiverse.com/thing:3363920 by d_chall using the same great fragar unicorn.
My thanks to all 3 of the authors.
Update: Added another STL with a thicker unicorn . This gives a little more rigidity to the legs and tail