Go onto you tube and play your favourite songs from when you were 5, 10, 15, 20 etc. Instant joy and a total release from current mindset.
Meditate or listen to affirmations while watching a candle burn. Very soothing. 5 mins is enough.
5 mins yoga stretches with Adriene on You Tube
Buy seed or cut up stale bread. Throw outside. Make coffee. Watch birds while sipping coffee.
Google Bucket Lists and make your own. Remember to include really ordinary every day and free stuff that you just never got around to doing (e.g. visiting local attraction in your own town, trying an easy hobby that you always thought looked good but just never did.)
Have a week of doing something new every day - try new recipe, new radio station, wear clothes in a different ensemble from usual, take a new route to work etc.
Pinterest a makeover for a room in your house. When you have time + money+ energy you will know what to do to transform it.
Cuddle your pets. If you have none, go for a walk and stop to pet willing cats you pass.
Watch comedy clips on you tube. SNL is good, or extracts from stand up shows by your favourite comedians.
Buy Poundland Epsom slats and have a long soak in a bath with a trashy novel or favourite magazine.