Data visualization and display on a webpage

We are developing a website which displays structured data from a database. The database can store the data (a lot of numbers) coming from various sources such as files, sensors, manually entered etc. The website is based on various technologies such as MySQL, Django, HTML, CSS etc. The main goal of the project is to display thumbnails (on the homepage) of selected charts where the main objective is to keep data size to be small. The thumbnails will represent some highlighted charts from profiles of different users. The thumbnails will show the name of the user and a snapshot of the chart.