You can make a zipper pull/key ring fob using the solomon bar. Over the years I have made and given away hundreds of them to waitstaff (as a bonus tip) and courteous store clerks. Please feel free to add a few knots to either the vertical or horizontal bars to suit your aesthetic needs. I did so in the photo showing the collection of crosses.
For this tutorial I used 2 - 4' length of paracord. The cords should be folded so that the uoter lengths are 1/2 the lengths of the inner.
One at a time take each cord end out of the loop it is going through, thread it through the split ring and back through the loop
Tie four more knots.
Reverse the whole shebang and 2" from the last knot begin knotting back towards the last knot.
Tie a total of eight knots in this direction.
Turn the cross on its side and about 3/4" from the body begin the left side of the cross. Tie three knots.
To tighten the side bar pull out on the center two strands. Then, one at a time, tighten the three knots.
Repeat for the other side.
The knot is complete. Trim and sear the ends.
An alternate start is to take one cord and fold it. A2 is short end, unlabeled is long end.
Tie second cord around it. B is long end, A1 is short end.
For this top section of the cross you will be knotting with the short ends A1 and A2. End B will fall into place beside the unlabeled long end. Tie four more knots and proceed as described above.