Oh most of us that change it so often make the आइकनों ourselves.
If आप ever find an image आप want to be an आइकन I could always make it for you. XD Ive made probably near a thousand या so आइकनों द्वारा now. I really enjoy making them
But essentially आप खोजिए up whatever आप want an आइकन of, आप find an image that आप think would make a good icon, take it to some kind of editting software (or paint if आप dont plan to do much to it), and at the very least, crop the image to be the size आप need it to be (square)
आप can get और creative with it the और your practice too
I usually used
link to संपादन करे and crop and all cause its like Photoshop but online free and has no downloads. Not as good as Photoshop but definitely plenty enough.