Update 2013-07-18: Here is a Stadium block overview in the form of an Excel sheet (version 2003 or later). It contains not only the images and block numbers, but also the block model names. Can come in handy if you like me use MapEdit a lot.
https://dl.dropbox.com/s/3mt7owmep9q5sy ... Models.xls
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Here are some block overviews I put together. 2 versions. Icons taken directly from game.
Squeezed as much as possible onto 1 screen. For 1080p screens.

Normal sized.

In Image Shack click the zoom icon first. Then you can click on the full size image and save it to your disk.