Working out and staying fit. Buying some nice underwear and bras after my second baby, even buying a "sexier" nursing bra - impractical yes but it helped!
Forcing myself to do things like go to the occasional work happy hour even I want to go home. I really lost my network when I became a mom and it's important to connect to people outside of work, family.
Splurging on things (not major splurges) like a handbag, just for me, occasionally.