The custom 'minifig' Lego creations were made by Caroline Parkin-Savage, Postdoctoral Research Associate at the MRC Centre for Developmental and Biomedical Genetics (CDBG) at the University of Sheffield.
Caroline, 32, from Stannington, who owns nearly 100,000 Lego bricks said: "You don't have to be a little kid to enjoy Lego. I started making minifigs about a year ago after getting back into Lego with some encouragement from my nephew.
"Since the opening ceremony I have become obsessed with the Olympics so I decided to make some Olympic minifigs including models of Jessica Ennis, Andy Murray, Sir Chris Hoy and Greg Rutherford to celebrate the spectacular success of Team GB.
"I made special 'good luck Jessica' minifig and then pre-empted the fantastic result slightly by making one of her with the gold medal around her neck.
"Everyone is so proud of Jessica here at the University and it is truly amazing what she has achieved. It is great to know she is a former student of the place I now work."
Caroline sells many of the quirky minifig creations online including her original roller derby figures and intricate science lab scenes based on the MRC-CDBG.
In January 2010 the University of Sheffield awarded Jessica an honorary degree and she was made a Sheffield Legend after being nominated by Sheffield residents as bringing the city recognition at national and international level.
She is also patron of the University's Elite Sport Performance Scheme (ESPS), which was launched in 2009 to provide financial and non-financial support to talented student athletes at the University, who are representing England, Wales, Scotland or Northern Ireland in one of Sport England's recognised sports.