Set up a folder on your computer desktop, and call it "bookplates." When you find a bookplate you would like to print out, right click on the image and save it to your hard drive in this folder so that you can find it easily.
Open a word processor such as Microsoft Word to a new file. Set your page margins to at least 1/2 inch. Insert the bookplate image you saved. Re-size the image to fit 1/4 of the page. Insert the image three more times, so that you have four copies of the bookplate on one page, arranged in a 2-by-2 grid. Save the file in PDF format if possible. If not, save it as a document file.
Insert the labels into your printer. Print the bookplates.
Cut the four bookplates apart using a paper cutter or a rolling cutter and a ruler to ensure straight cuts. Peel the backing off the printed sheet and position the bookplate inside your book's front cover.