The best way to find images from the web is by using Google Image search.The keywords for the image search are based on the filename of the image, the link text pointing to the image, and text adjacent to the image.Even though most of the image search engines have the ability to filter out the image search results based on small,medium or large, recently Google have introduced a new search parameter that lets you search for particular image sizes in Google Images.
Search parameter is imagesize:WIDTHxHEIGHT
Look at an example shown below.Search for 125 x 125 size images related to windows7.Command to enter [windows7 imagesize:125×125]
How to search for High quality images using Google Search
This Image search option is very much helpful if you want to search some high quality and widescreen wallpapers of particular size for your computer.If you want to search for wallpaper images having certain size of 1280×800 , then enter “keyword imagesize:1280×800” into Google image search.For example if you want to search for wallpapers of ferrari having size 1280×800 then enter “ferrari imagesize:1280×800”.
You can also use this image search trick for getting the 125×125 size banners for your blog or site.