You can't normally make 1hour graphs, because of the data collection resolution.
A normal graph is approx 400 pixels wide.
If you use the default 5min data collection interval, the RRD database files store approx 800 data points per RRA, which corresponds to 2days. Originally this was 400 datapoints, which is why the default highest resolution is a Daily graph.
If you have set a 1min data collection interval, then this changes to be a 6hour interval, which is why the highest resolution is 6hours. However I don't think the MRTG bundle uses 1minute intervals by default?
If you ask RRDTool to generate a 1-hour graph, it will do so, but it will be very blocky as it simply doesnt have the data in enough detail to do this smoothly.
You can change all the colours fonts and styles of the page by using the CSS file (if you have Routers2 v2.19 or later) or by changing the colour options in the routers2.conf.
There are several alternative icon sets available for download and install, if you want to change the icons. You can get them from http://www.steveshipway.org/software
in the Routers2 section, along with all the language packs.