Yipes, Stripes!
Did the OP ever decide on a stripe???
I just finished my Plum Crazy 1970 Dart and was going to put on a White bumblebee stripe. After having the car in purple for a few months, we decided to go with a less "in your face " stripe. Since I did the interior in metallic silver with black trim, we decided on a dark silver metallic stripe so I contacted Phoenix Graphics. They sent me 4 different flavors in that color that 3M offered as base material. We picked a "gunmetal silver" with lots of metallic in the stripe to match the metallic in the Plum Crazy. They charged me an extra 25% for the custom color. Just got them applied last week and I couldn't be happier. The metallic even lets the stripes change hue like the paint does at different angles in the sun.
If the OP has a green interior like my Dart Custom, the interior paint trim is a great shade of dark metallic green that might be a candidate. Just ask Phoenix for a swatch of every green they can offer.