Themed Christmas trees are fun to do once in a while. When we lived 
in a home with a family room and a living room (and I had lots more 
energy) I did a themed tree each year in the living room. Years ago, I 
also recycled styrofoam cups by melting them and shaping them into 
little ladies' hats as favors for a ladies banquet. These would make a 
great themed tree as well. With some tulle and beads for garland and a 
few silk flowers and baby's breath placed around the branches, you will 
end up with a beautiful 

Victorian-looking Christmas tree.
For the hats you will need:
Styrofoam cups (if used be sure to wash and dry thoroughly)
dark coated cookie sheet (will not melt properly on plain aluminum or stainless)
small silk flowers, poinsettias
small beads
small/thin ribbons
hot glue gun 
Preheat oven to 250 degrees.
Place
 a test cup upside down on the cookie sheet and set in oven. It will 
take about a minute before you see a change and about 1-2 minutes more 
before you have something that looks like a mini-hat. The test cup 
should give you a good idea of timing but don't put any in the oven and 
walk away. Also, be careful of the fumes that may build up in the oven. 
Don't continually inhale them directly. Remove test cup from oven and 
let cool on the cookie sheet. The cup will stick to the surface until it
 is completely cooled.
Now you're
 ready for a batch of hats. Place the cups upside down about 1-2" apart 
on the cookie sheet. Remember not to walk away from the oven! Watch them
 melt and pull out the sheet of cups at the appropriate time. Let them 
cool completely on the cookie sheet and then remove them and do another 
batch. Some of the cups will be a bit distorted but most should come out
 looking like little hats. All will be a little different. 
When
 you are done melting your cups and they've cooled, begin the fun. 
Decorate each with the beads, ribbons, flowers, etc. and be sure to add a
 ribbon, string, or wire for hanging on the tree. 
If you like, you could also use acrylic paints to add more color to your hats.