Pull Attachment Images From Multiple WordPress Posts and Place in Grid

We have 7 wordpress posts. Each of these 7 will have a few images uploaded (attached). We would like to do the following: -Display images from each post in a grid on the homepage of our wordpress site. So post 1 will display 3 images, then post 2 will display 3 images (or as many as are uploaded to the post). All will be attachment images -Display grid in three column format with no padding -Allow images to fit after uploading -Link each image to the correlating post that it is attached to -Allow images to be any height, fit the width 100% to column width -If we can order the attachments it would be great too, maybe by upload or image name (ex: [login to view URL], [login to view URL]) shows 1 then 2. -IF POSSIBLE: we would like to order all of the grid images by an image number or in some other way. For example: instead of ordering by post and attachments to that post, it would display all attachments from (post 1, post 2, post3 etc) and show all images at once. The order would be able to be changed somehow.