*ETA: on choosing paint and its applications and regarding ceiling color:
http://realestate.msn.com/article.aspx?cp-documentid=1310...
http://colorindesign.net/2011/02/03/looking-up-what-color...
If you must use those colors:
Use the lilac and/or the sage green for accessories.
Use the "taupe" for the walls.
Because, if you use the taupe for the walls, then even if you change your mind about colors, it can easily be done... via just changing out the accessories.
Accessories, meaning, nothing that is built in.
ie: pillows, vases, area rugs, picture frames, knick-knacks etc.
Use curtain colors, that will either:
be a statement in itself. ie: an accent color.
OR, that will blend in or complement the wall color.
And, per your furniture, well that is as it is.
If you paint it, you gotta sand it first. Then paint it. Then apply a Varathane clear coat to it, to protect the paint. And then it can be simply wiped down. And it is waterproof as well.
The ceiling... is typically same as the walls. Unless you want a real contrast. Or a color that will "disappear."
For walls, use an "eggshell" finish paint. It is not glossy but not matte, and it is a finish that you can still wipe down if there are smudges on it.
Baseboards, are typically a darker color. Because, it gets banged up a lot or scuffed. BUT, whatever color you use on the baseboards, the finish on it of the paint, is typically a "gloss" or "high gloss" paint. And these finishes can be easily cleaned, wiped down.
Just do NOT use "matte" paint anywhere. Because, matte paint, will get stained/scuffed and get fingerprints on it (like at the light switches where it is heavily used) and matte paint, cannot be cleaned so easily.
Here is a link for you, per "Valspar Oregon Coast" paint color:
http://www.notesfromthetrenches.com/reviews/help-me-makeo...
Just look up that color, and see how they use it. To give you ideas as well.
Its a nice taupe color.
We have something similar in our bathroom.
You can go real modern with this color, or real nice and traditional.
Again, depending on your existing furniture styles and the accessories you choose.
The "Imperial Lilac" you choose is nice too.
Just look up the colors you chose, and get ideas online.