FlamingText.com - is a free online design tool where you can create your own logo, buttons and more. You can use these logos on your website, in your email signature, or wherever you like.
As an additional, Flaming text also have a image editor where you can upload image from your file. You can add text, stickers, shapes and logos, Borders, crop and also photo effects like blur, old photo, glass tile, mosaic etc.
Link to this site: http://www.flamingtext.com/imagebot/editor#_home