The Colored Pencil Society of America sponsors two competitions each year. One, the annual juried show held in conjunction with its annual conference, is for works created exclusively in colored pencil. That competition's deadline is March 31st.
The other, the "Explore This!" competition, is for mixed media explorations that include colored pencil as one of the media. The deadline for this competition last year was November 15th, so I'm guessing it will be some time about then for this year also.
The library has a number of books on creating with colored pencil and mixed media. Here's a sampling:
Check the Harris County Public Library catalog for these and other books at our online website http://www.hcpl.net