Jojo92,
I somehow don't think that's your real name

Anyway, no, there's no way to do what you're asking, via just literally taking someone's page from the gallery and physically removing parts of it to put onto your own page.
There are, however, pre-made pages like that, which you can buy from most any digital scrapbooking site. The ones here in the store are called "Page Bytes", and have all of the elements, photo mats, drop shadows and the whole bit already there, you just put your pages onto them. Some designers even include a pre-made page in the kits they sell, I know just off hand that Michelle Underwood usually does this, and it helped me immensely when I was first starting. I didn't use one of her pre-made pages, but looking at it up close helped me figure out how to do some things.
Otherwise, most people who post in the gallery list what they used on the page, some list a bit more detail, so that you can actually go find the particular item. If you want something, and you can't figure out where to get it, either post in the forums "Where did xxx on this layout come from?" Or, PM the person who made the page (probably easier.)
Billie