Here is an example of an image I changed to better match my current blog decor:
The original with the black frame was taken from here
I cropped the center image and added it to another frame which matched my blog colors better.
To grab one of these cute things, all you have to do is find an image, "right click" on your mouse, and select the "Save image as..." option. Be sure to make sure you are saving the picture in a file where you will be able to find it! Then, find your blog editing page and "add a gadget." The image you selected can be added as a photo. You can add the hyperlink to give credit to the website where you retrieved the image, or just list in in the "title" box.
If you don't find an image or quote that you like, (obviously you could use any home decor site that you like) another option would be to use your own favorite sayings.
I got the frame from an image here, but I changed the saying in the middle using PhotoShop and then added some stars for cuteness.