Below is the index to all the colour swatches. Each swatch of 64 colours shows blue being added gradually from the first to the last; green is increased from one swatch to the next; and red is increased from one block of 64 swatches to the next. You may find it more interesting to start in the centre somewhere :) the early colours (00, 01 etc.) tend to be pretty dark and not easily distinguishable on a browser.
You can track the red increase by moving sequentially down the table below (or by selecting a sequentially-higher value for red on individual swatch pages). Note that in the type of notation used, the sequence is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, e, f - and that the first of the two numbers or letters within each set acts like the "tens" in tens-and-units - so a change of the first digit usually means a stronger colour-change than the same degree of increase in the second digit of the pair.
Of the six numbers/letters for each colour, the first two are "red", the second two are "green" and the final two are "blue". eg #000000 means no red, no green, no blue (so no colour is present, and black is how #000000 presents on the web page).
Have fun with your pagebuilding! If you need some free software, there's a very simple program called Arachnophilia (the old, non-java version, the same as we use for building this site), available for download here. Developed by Paul Lutus who decided to give it away rather than charge money for it, Arachnophilia lets you work on up to 100 pages at a time ..... and there are some guidelines on his download page, to help you get started with building webpages.