Sure, you could just leave it looking like all of the other desktop folders you have, but that would be so hum-drum and boring for someone who is into DIY projects! So, make your own Instructables Robot icon for your folder!
Step 1: Create an icon from a PNG or JPEG using a free online service
for converting image files to .ICO (icon) files. It is a FREE website and very easy to use. Just navigate to their website and follow the simple instructions. You browse to the location of the image file you want to convert to an icon, upload it and click on GO, and you icon show up in the upper right hand corner. You just click on it to download your newly created icon back to your computer, and you're ready to go!
You can of course, use any program or web service you choose to complete this step.
Note - you will need to know where you have saved your new icon in the nest steps, so make sure you remember where you saved it!