A rainbow threw up on my room...and I like it.
Some time saving tips: laminate posters, string together flags and pennants so you only have to use a couple of staples, cover entire walls with paper (top of the ceiling -to the floor) it makes the room look larger, save your borders every year (they are pricy!), go to Allposters.com when they have sales or look in their clearance for inexpensive posters (sometimes only a dollar!) and invest in a staple gun (best investment EVER).
Showcase where you went/go to college. I currently attend USC so the helmet (a gift from my husband...he knows me so well) serves two purposes: 1) To teach about the Roman Empire/ Legion Armies and 2) USC Trojan mascot representing!
Use protective cover sheets to post your standards and Essential questions, or anything that you change frequently.