One of the easiest ways to get a straight & interesting border is to cut your journal page edges into geometric shapes or contoured lines like the hexi shape I cut into the corner above. Write your quote around your journal page following the line you cut to box it all in.
Washi tape makes a great bottom edge to any border so you don't have to write your words upside down (though sometimes I will anyway just for fun). If the strips of washi seems too boring by itself, scallops doodled underneath save the day every time; if you have too many words to go around your journal page, try writing them in different directions or spacing them out around your central image.
Sometimes I like to write longer quotes or definitions as my border, and other times all it takes is a little snippet of inspiration; waves, scallops, and straight lines all make fabulous bottom boundaries when it comes to borders.
you can cycle thru these shots below to see my process in action
I'll leave you with one last thought and a bit of scrap art:
I'm really into Studio Calico's Project Life kits for art journaling right now, but I don't want you thinking you have to have expensive art supplies to make amazing art. Here, I used a leftover bag from a card store, magazine images cut into houses, chalk markers I got 40% off with a coupon, and two Pitt Artist Pens (my ace in the hole when it comes to hand lettering): less than $15 when all is said and done, and the results are just as wonderful as the pieces above with all the shmancy supplies.