Wondering what the blue suitcase with the white chip in the corner and the screw driver and wrench mean?

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decoder for the suitcase symbols is at bottom of page. Basically how active is the topic.

Like you - I have no idea on the other tool symbols and look forward to someone's explanation.

Them are "folders" which are "containers" also known as "threads".

Here's a breakdown of colors:

- Dark blue:
Thread with small number of replies and new posts you haven't read yet

- Dark blue with little white mark in the lower right corner:
Thread with small number of replies and you have already actively participated in that thread and new posts you haven't read yet

- Light blue:
Thread with small number of replies but no new posts

- Light blue with little white mark in the lower right corner:
Thread with small number of replies and you have already actively participated in that thread but no new posts

- Red:
Same as above but for "hot" threads with more replies

- Wrench and Screwdriver Icon:
Indicates that someone deemed this their "build thread". It's one of the thread icons you can choose when starting a thread.