You asked me where you could find them, and I responded to that. I do not know if there is an add-on for your charting software.
You did. This was in the back of mind and was my follow up once I found the charts. But I didn't yet as my provider doesn't. So doesn't eSignal. Anyhow, still interested to know because I thought you were pointing me to a specific thing.
Best thing I can suggest is to Google around for a Renko/Unirenko plugin for your charting software. Or start a thread in here and ask! https://www.elitetrader.com/et/forums/trading-software.3/
Yes, you're correct. In a 2T (2-tick) chart, each candlestick represents two price points. For a green candle, the first tick (left side) is lower than the second tick (right side), meaning price moved up. For a red candle, the first tick is higher than the second, indicating a price move down. Each candlestick is independent and doesn't consider previous ones, so the green/red color reflects the price movement between those two ticks only. The same concept applies to 5-second candlesticks; they just use a different time frame but follow similar rules for price movement and coloring.