Get the Excel spreadsheet as you want it.
Press 'Fn' and F11
Open MS Photo Editor
Click 'Edit' then 'Paste as new image'
Once you've done that, click 'save as' and give it a name. It will then be saved as a .jpg picture to wherever you want it. Or you can save it in another format if you wish.
Then when you're sending the e-mail, either insert it as a picture into the text (if you're using rich text) or just attach it using the 'paperclip' symbol.
There are probably better ways, but it works for me OK!