step one:
choose your papers
The colors for Weston's shower were a light teal and lime green so I chose a few different patterned papers in those colors.
step two:
trace triangles
Make a triangle to trace onto the back of the patterned papers. I just used a straight edge and eyeballed it to make my triangle but if you have something triangle shaped you can trace that. I made mine on a piece of poster paper so that the paper was a bit heavier and easier to trace onto the patterned papers.
step three:
cut out triangles
step three:
cut out triangles
step four:
add letters
Ok, I apologize I kind of skipped a step or two in here but I was so absorbed in making it that I forgot to take pictures so I'll explain it and if you need me to clarify please let me know.
So for the letters I took the solid green and teal papers and traced circles on them. I looked around my house for a circle that would fit best on my triangles and found that the lid to a mason jar worked best. Once I had traced and cut out my circles I laid them out onto the triangles so that a green circle was on each teal triangle and a teal circle was on each green triangle and glued them down. Then I arranged the triangles in the order I wanted them to hang. Next I wrote the letters on the circles so that they spelled out "Welcome Weston"(I intentionally left three triangles blank so I could have one on each end of the sign and one in between the words). 
Once the triangles were set I strung them on a piece of yarn and tada, it was ready to hang.

