We need just 18 small icons, and 5 buttons, many of them being variations in the same set. What we currently have, are only placeholders, and they are listed in the attached PDF document.
Due to different screen resolutions of the target phones, the buttons and arrow icons may be stretched vertically, so the images should look OK under these conditions, too.
The images can be in any of JPG, GIF, PNG formats, basically using a max of 256 colors, to result in smaller file sizes. A PSD with all the images (or image sets) would be also nice to get.