Holy Royal Purple. If you don't feel comfortable going for the permanent upholstery, try a throw and/or some fun pillows in this color.
A cornice box is another easy DIY project you can accomplish without major commitment.
I love this pink! If you don't want to invest in the upholstered bed, use wall color and bedding instead.
Notice that all of the pops of color here could easily be swapped out if you go through some sort of neutral Zen phase.
I have to say, I just love this raspberry chair. I think I might just commit to it. However, you can achieve a similar affect with a slipcover if you are unsure how long you'll be thinking pink.
If I recall, this designer's name is Fern Galli, or something like that. This room from Domino is burned on my brain, and shows how you can liven things up with dramatic drapes (and a big deer...).
The green on the right wall could be achieved with fabric canvases, or even fabric hanging from a pole.
Wall color aside, all of the accessories here could easily be swapped out for many different looks. The terracotta walls would look great with most colors, and having a neutral sofa makes the possibilities of rug/throw/pillow combos endless.
This is a great example of how one piece of art can give you all the color you need. If you're on a budget, you can achieve this look with a large canvas painted one color.
This is the same general idea as above, plus bold pink paint.
With it's barely-off-white base, the accessories in this room could easily be swapped out when you're hankering for a new palette. Also, sometimes flowers like those alliums give you all the bold color you need.
The entire feel of this room can be changed with a changing of the sheets. Minimal commitment to chartreuse or grape is required.
This doesn't really have anything to do with my how-to theme, I just love the colors.
When you make a mini-commitment to dark paint like this, just remember you'll have to prime the heck out of it if you ever want a change.
One simple piece of furniture is all this space needed to inject it with some shazam!
I never would have thought to paint only the ceiling in a bold color in a million years. I like it.
This has a look that reminds me of one of my favorite designers, Luis Barragan. Don't forget to bring the bold outside.
Kim Johnson understands color theory. You might want to do a little reading on the subject before trying this at home. Or not.
...totally belongs with these chairs.