hungken on "Only display featured image of the first post"

I want to know how to displayed random post like image below:

http://i.imgur.com/ejNRh1e.png

That is, the code will display a list of 8 random posts, but only show the first post featured image and post excerpts of it. the next post will show the title and nothing else

Please give me the code to do this! I use it to insert a widget supports PHP, If possible, please include simple css

Thanks for your help!!!!

(Sorry for my english)