Yesterday i wrote just a very simple program that will make every pixel on your screen display every possible color. The program takes a long time to run, i estimated it to run for ten hours on my laptop but it ended up running for 12.
hide mouse
sync on
red=0
green=0
blue=0
hours#=0
time2=0
time=timer()
for red=0 to 255 step 1
for green=0 to 255 step 1
for blue=0 to 255 step 1
cls rgb(red,green,blue)
sync
if escapekey()=1
end
endif
next blue
next green
next red
cls rgb(0,0,0)
time2=timer()-time
hours#=time2/1000
print "All possible colors have been displayed! Thank you for wasting ",hours#," hours of your life on this program! xD"
sync
wait key
When this program is finished running, each pixel on your screen will have displayed all 16,777,216 colors possible to display.
Again, be warned, this program takes a VERY long time to complete; if you are willing to waste your time and use this pointless program

make sure you do it overnight! Mine took 12 hours to complete! If you do need to end the program, use task manager!
Edit: I added an escape function, so feel free to press escape at anytime to end the program!