Open paint, Create your Signature
Save the file as sig0.jpeg . Open your Gmail account. Click on settings
Click on Labs
Enable Inserting images
Save Changes
Click on compose mail
Click on add image, Choose file
Select your file
Open , Copy your signature into Clipboard by clicking the right mouse button and selecting "Copy image"
Right Click on account settings and open it in a new tab
Click on the General tab
Go to Signature
Right click and paste your signature
Save Changes
Go to Compose mail and check whether the signature came there
Here after you can use this signature in all your mails