Tommy

Here is my answer to puzzle 1:

Repeat 5 [arcr 180 20 right 180]

Experimentation with spiral:

growby 3% 2000 [ rotate 180 [ spin (80) [ color red [line -171 134 -4 5] color yellow [line 185 134 2 6] color blue [line -169 -128 -3 3] color hsb (240 - index2/2000*240) 100 100 [line 181 -138 5 7] ] ] ]