There are some things which are and will always be eternally true: vanilla things smell good, Mathew Gray Gubler is a hot guy, and that some boring but easy things can really help out your skin. These tips aren't revolutionary, exciting or glamorous, and certainly aren't as fun as buying nice smelling pretty things in containers. They are boring old habits, and they work.
1) Drinking water. Your body needs water for all of the "important" organs (brain, liver, kidneys ... yawn), and if there isn't enough in your body, it will steal it from your skin. Skin without water isn't so cute: dull, liney, un-plumped. So by constantly putting lots of water into your body, you can prevent this from happening really really easily. Also, water is free (unless you're buying it which is dumb) and good for your whole bod.
2) Exercise. I hate exercising as much as the next man but getting really sweaty about twice a week seems to be helping out my skin. I imagine that all the sweat coming out of your pores stops them from getting clogged (sort of like a facial laxative, and I am sorry for that image). Also, the attractive big red face that follows exercising means there is lots of blood circulating around your chops, which is almost certainly a Good Thing. Also it might help you live longer, etc, whatever.
3) Facial Massage. At night when I moisturise, I always try to sculpt my face into shape using the Lisa Eldridge vid as my guide. This does things I don't fully understand such as improving circulation and draining lymphs (?) but makes your face glowy and will hopefully help the descent into old age be a little easier.
Boring but beneficial, and also free and good for more than just your face. Turns out common knowledge becomes common for a reason - it is usually pretty solid advice.