All of the artwork we offer is 100% hand painted. This includes all calligraphy.
I don't have tiles or other media, however, if you need patterns (large images) of certain characters, we do offer that service (it falls under our tattoo service).
Let me know what order you want the elements to be in (if you want them on one scroll).
Otherwise, you can find all of these ready for single-character scrolls here:
Earth in Chinese and Japanese
Fire in Chinese and Japanese
The element of water in Chinese and Japanese
Vapor, steam, energy, essence, gas, or air in Chinese and Japanese
Concepts of nothingness in Chinese and Japanese
As you choose, I would use the traditional form of Qi/Chi, as it is the oldest, and before the reforms in Mainland China, and Japan after the war, they both used the same form. In Japan, they replaced the rice-radical that sits under (as if in a pot) with two strokes that form an X. In the mainland they just removed the rice-radical completely.

Traditional Chinese/ Japanese Form

Modern Japanese

Simplified Chinese
In the traditional form the rice-radical represents boiling rice in a pot, and the rest of the character represents the steam rising from the pot. This steam idea is where the concept of energy, essence, and air came from. Some "ancient scientists" even believed that the steam was the soul, in visible form, escaping from the rice (or from a body as you burned it).
This character has been used in many ways, so the context in which you use it does matter. For example, it's used a parts of words to describe many kinds of weather formations and conditions.
It's "Ki" (pronounced like "key") in Japanese, and is parts of words like "Aikido", "Reiki" (a healing art), and Yuuki (courage).
In Chinese it's Romanized as Qi or Chi, and you can see it in Tai Chi / Tai Qi, Qi Gong / Chi Kung, and Chinese doctors may speak in terms of your level or Chi/Qi or how it is flowing through your body.
Cheers,
-Gary.