Gmail Introduced Rich Text Signatures

Now Gmail users can put their signature using rich text in their mail. This gives you the freedom to attach images as well as text in different fonts and colours. To change your signature to something cool and colourful, you just need to go to Settings of your gmail account and in the signature section you would be presented with an editor which supports rich text instead of old text area which was presented before.

Also if you have multiple Gmail accounts mapped on one id, you can use different signature for each id using a simple drop down menu. This menu might not be available for those who are having a single Gmail id.