As a brief note, when I say brown or red I mean the same color for this picture.
I decided to start off with 5 colors so I chose blue, yellow, orange, green, and what I thought was red but apparently is brown (I only have a box of 12 color pencils and 3 are green apparently lol.) I had started on the outside edge before friend mentioned "blending." I wanted to do some symmetry and the brown was appealing so I chose that as one of the corner colors. I didn't want to use orange or green because I figured they were too close to the brown in color and I wanted to start with some contrast so I decided on yellow as the other color. So I did my red/yellow pattern.
I had the little "hats" to put on top of the red/yellow and the "nose." I figured red + yellow = orange so I made that the "nose", but I wanted to keep the alternating them going so I used blue also. That left me with green which I decided to alternate as the "hat", once again keeping with the alternating theme adding blue in.
(I'm into patterns a lot now, I think it may have been tickled with my 2cp trip which I saw the field I usually play frisbee on. The footprints in the field, probably 25 yards across and 60 long, made one giant pattern. Then I had my lucy trip which may have triggered something in my noggin to start drawing. But this is all speculation.)
Then it came time for the outer drawing of the inside. I decided a little more orange was needed so I made the corners between the alternating red/yellow orange. I don't know if you can see it but I messed with bleeding the colors over by coloring over the lines into the red/yellow and coloring the orange red/yellow. Then I just started doing this rainbow thing that merged the colors.
The next pattern was the inner which just sort of became the box you see. I decided I wanted to continue the blending but wanted to make a contrast so I went from my rainbow in which the last rainbow was green/orange to doing the outer layer of the box black. Followed by a dark blue, light blue, etc. so that it melted but had the lines of black/dark blue to separate.
Overall it was a mix of sporadic coloring decisions and some contemplating. The eyes thing was random, I saw something I liked and left it. I also did some light shading of black over the the rainbow and box to help it blend.