Cursor try-on
Every pointer a browser already knows how to draw, for ideas. Hover a box and your mouse wears it. These are the built-in ones; your own drawn cursor goes in the same way, see the bottom of the page.
The built-in set
Try your own drawing
Pick a PNG or GIF from your computer and it becomes the pointer inside the box below. Nothing is uploaded anywhere; it stays in your browser. 32x32 is the safe size, and the hotspot (the pixel that does the clicking) is the top-left corner unless you say otherwise.
move the mouse in here after choosing a file
When one is right, the line for your stylesheet is:
cursor: url(your-cursor.png) 0 0, auto;