No, you cannot create your own pictogram. The Ministry and the ADEME have legislated on the «info-tri» sorting options and these are only the ones that you can find in the Guide and the pictograms files that can be downloaded on our website.
You are not allowed to put 2 pictograms in the «info-tri» sorting (whatever they are). You have the choice to put only 1 or all 3 together. So you cannot for example mix the t-shirt and linen pictograms.
In the elements to download on our site, recommended symbols are provided.