Need an button artist for a graphing calculator

Anyone want to design a couple of intuitive looking buttons for a graphing calculator? I'm not offering any kind of employment, just really looking for someone who's interested in this kind of thing and would like to help out. You don't have to contact me if you want to do it, just simple design them and post them and we can all decide on which ones we think are the best. For some reason, certain buttons I'm having difficulty envisioning something that would make their function intuitive without any text.

So anyway, what I'm looking for is:

A visible / invisible toggle - 45px by 45px
-- Two buttons that toggle the visibility of a specific function being graphed.

A "full screen" button - 70px by 70px
-- Button that simply makes the graph area full screen when pressed

A return to origin button - 70px by 70px
-- Button that returns the graph to (0,0) when pressed

A selection mode toggle - 70px by 70px
-- Two buttons that toggle between "drag mode" (dragging your finger/stylus along the graph moves it) and "select mode" (dragging your finger/style along the graph moves the selection point)

The theme of all of these buttons should be black on a white background with a 1px border and no depth. Below is a sample button from the project to give you an idea of the theme.

That should about do it for now. Again, this is purely for your own enjoyment and should be done at your leisure.