Monochromatic designs can be so fun to stitch. All-in-one color or mix it up and use a variegated design for a little fun. This angel and bird mirrored design is pretty in blue as shown here, but would also be fun in pinks or reds or a mix of both.
Ant of Sweden has a nice mix of free charts including this one.
Cross Stitch with Art is a Ukraine-based Etsy shop with more than 1,000 patterns covering a wide range of subject matter, from sarcastic (and stabby) animals to jokes about mental health, tarot cards, holiday designs and a lot more.