; insert this line after the commodore stuff in your startup-sequence
SET RANDPIC Work:Graphics/Pix/Startup`c:rand 1 4`.pic ; NOTE the TILDE quote
SET RANDPAL Work:Graphics/Palettes/Palette`c:rand 1 12`
c:bootshow F 3 T 16 P $RANDPAL $RANDPIC
UNSET RANDPIC
UNSET RANDPAL
; followed  by the rest of your startup