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Screenshots
Screenshots of a command-line program? Not at all. Here are some picture maps of matrices generated with matgen. To make these picture maps I used MatView, a handy Tcl/Tk tool for viewing and exploring matrices in MatrixMarket file format, specially random sparse matrices.

matrix01
 
100x100 diagonal dominant random sparse matrix with 0.15 non-zero density. Non-diagonal members are between 0 and 1. The colormap shown is related to the value of the components.
(input file).
 
matrix02
 
1000x700 random sparse matrix with 0.0020 non-zero density.
(input file).
 
matrix03
 
500x4 random sparse matrix with 0.5 non-zero density.
(input file).
 
matrix04
 
5000x5000 diagonal dominant random sparse by row with number of non-zeros per row between 2 and 10.
(input file).
 
matrix05
 
100x300 diagonal dominant random sparse by row with number of non-zeros per row between 2 and 10.
(input file).