Yes, I also like the ways William Beaty explains
"Which way does the "electricity" really flow?"
and the distinction between the flow of charged particles (nearly always very slow) and the flow of electrical energy (nearly always very fast).
(Alas, this isn't really an answer to your question, but a response to some of the responses to it).
The only way you can get positive charges to move (instead of the absence of negative charges, if we're going to differentiate that) is through transporting atom nuclei.
Yes, that is exactly how positive charge does move.
In a proton conductor such as ice, you can think of the moving positive charges as hydrogen nuclei.
"In a solid or crystal structure the flow of positive charges will be extremely slow, and possibly damaging"
Yes. Also, the flow of electrons is also surprisingly slow, and often damaging.
The charged particles that move through solids are typically very small -- electrons in a metal, protons in a proton conductor.
On the other hand, quite large charged particles -- both positive and negative -- flow through battery electrolyte (liquid) and during electric glow discharge (gas).
Some people claim that current in fluorescent bulbs is indeed the flow of electrons.
Yes, during the brief fraction of a second when first applying power to a "cold" tube, electrons are the only charged particles available.
When first starting a "cold" tube,
the cathode (because it is metal) has plenty of movable "free" electrons available,
and yet the tube has a very high resistance.
Later, after striking an electric "arc" (electric glow discharge), during normal operation of a fluorescent bulb or neon light, there are lots of charged ions available.
Since the tube has a much lower resistance at that time, (a) fluorescent tubes require ballast, and (b) we are led to conclude that most of current involves charged ions rather than electrons.
When a fluorescent lamp "operated from DC, the starting switch is often arranged to reverse the polarity of the supply to the lamp each time it is started; otherwise, the mercury accumulates at one end of the tube." -- Wikipedia
This is evidence that charged mercury ions physically move in a fluorescent lamp.