So, I'll admit I like my coffee with a lot of sweetener and flavoring.
What I don't like is that the stuff you buy in the store with the flavors also has a lot of oil, preservatives, and HFCS. I try to have as little HFCS as possible.
So, the first day I was on Pinterest I found this recipe, and I'm now on my second batch of homemade creamer.
14oz sweetened condensed milk
14oz milk (whole, lowfat, or skim - doesn't matter)
2 teaspoons extract of choice or coffee syrup (I've made hazlenut and vanilla)
a mason jar (quart is perfect)
Pour all of the ingredients into your mason jar. Screw the lid on tightly and shake vigorously for a few minutes until well combined.
I think this probably has a pretty short shelf life, but I used one batch in a week, and it seemed fine to me. You could use half and half if you wanted -- if your half and half is like mine, it's got a really long shelf life, so it'd probably make your creamer last longer.