Some things you will need:
cardboard triangle and size or shape you would like
frame that is bigger than your tree shape
piece of fabric cut to fit your frame with iron-on backing ironed on
glue (white and hot)
I started by covering my cardboard tree shape with glue, any thick white glue would work.
Then I had Moses (and Doug) cover the glue with buttons...adding more glue when necessary. I did mostly green but you could do any number of color combos.
When the triangle was covered and the glue was dry enough...I added a coat of mod-podge and covered it with glitter. I let it dry over night at this point.
Then, I got Moses to write "joy" for me...and traced it onto my fabric using embroidery tracing paper...then stitched over that in red.
I assembled my frame by first hot gluing the fabric into the frame...then adding the glass then the frame backing...then using more hot glue, I glued the tree in place.
A cute cooperative effort...if I do day so myself. :)
You could also stop with the tree and add a ribbon to hang it as an ornament. I think it would make a great little gift for a teacher or relative.