This is a Christmas card I made for my SO, who is a big fan of Gravity Falls and consequently got me into it.
I imagine Mabel feels sad that they're only sticking around GF for the summer, so she wants to have a mini-Christmas with Grunkle Stan et al. Meanwhile, there's something goin' down with Dipper and Bill Cipher, because nothing can run smoothly now can it? ^_^
Happy Holidays everyone!