To my Red Wing, Minnesota friend - I have some of those and I use them to make lighter cubes. Take some paraffin wax and melt it. Take some wood chips and, using a mini-muffin pan, or one of the cardboard (not Styrofoam) egg cartons, fill each little mold/container about half to 2/3rd full of the fine chips, then remove the wax from the heat and let it cool just a bit (so it doesn't run straight through your cardboard if you are using egg crates) and then pour it over the chips in the molds. Let the muffin pan or egg carton cool (or put them in the fridge or freezer) until the wax has hardened.
You can pop the cubes out of the muffin pan or just use a pair of heavy shears to cut apart the egg crate and you have some nice, easy to use charcoal lighter cubes!
I've done this several times and the cubes work great in my ceramic cookers or underneath a chimney of charcoal.
Pat