Basically my idea is a program that'll graph trends in the item market (not the board) based on prices of particular items (right foot texture, viridian relax, etc), particular colours (vampire, marine, etc) and particular colour groups (red, green, blue, etc). (APPARENTLY THE SAME THING AS RUNESCAPE GRAND EXCHANGE GRAPHS)

The graphs will show minimum + maximum prices and changes in prices over a particular amount of time (probably about a month variable), checked + generated daily or however often I think is necessary.

SUGGESTED AND APPROVED:
- Direct comparison between items/groups on a single graph (will be interesting to see what sort of price correlations come up :D)

Any suggestions as to (more) cool features I could integrate, before I get started?

AN EXAMPLE GRAPH: