Your memory books are only as good as your photos, so being able to take a good picture is a must in scrapbooking. Anyone wanting to find a free photography tutorial can do so by searching online. You'll be amazed at how much is available free if you look for it. These same classes offline very often start out at $50 or more for basic instruction.
On the other hand, vector graphic clipart can be enlarged without losing any distinctive form. It can be enlarged without becoming diluted but you need software that can import them. Vector graphics are used a lot for machine applications such as vinyl cutters, laser machines, CNC machines, etc. This is because the computer machine can follow the lines to cut the clipart out on something.
And then your friend finds out. Will he be a little bit hurt? Maybe. He might claim that this is his first time being late, that he won't ever be late again-well, that's not such a big deal. You don't have to argue it with him. Just explain. Tell him you're not crediting the clip art to him, so it won't sully his reputation (and if you have done your work right, the free graphics you've got are good enough that he shouldn't worry). Tell him you're just waiting and that you needed something in place. If he's really concerned about his art, it might speed him up; if he isn't it might slow him down. In either case, with your free clipart, you're set. You can let things run themselves and go join your buddy on the couch for potato chips and movies. After all, he might not start working on your project any time soon.